Active and Passive mm-Wave Imaging for Concealed Weapon Detection and Surveillance

Sensors used for security purposes have to cover the non invasive control of men as well as surroundings of buildings. The work described in this paper concentrates mainly on sensors at 0.1 and 0.2 THz, which are able to detect non metallic objects like ceramic knifes as well as metallic objects hidden under clothes. Here we show active and passive systems, based on state-of-the-art solid-state components.